ring counting

例句：

1. 1. Thering count method is used to determine the number of rings in a circle.
   环计数法用于确定圆中的环数。
2. 2.Ring counting is an important technique for measuring the size of objects.
   环形计数是一种重要的测量物体大小的方法。
3. 3. In ring counting, each ring is counted separately and then added together.
   在环形计数中，每个环单独计数，然后相加。